"fellow on the island".

"One of the conditions of our wager is that I must not reveal my
identity," returned the anonymous amateur. "He's bound by like terms. He
does not dare give you his name and address."

"That fellow is insane or a villain," declared "Crusoe". "I do not know
who he is, but if I starve to death, he'll be a wanton murderer. My name
is Raymond Flood. I am not a college student. I am a high school student
at Kingston."

"Is his name Raymond Flood?" was Cub's next query intended for the
anonymous amateur.

"No," was the latter's reply.

"What is it?"

"Under terms of our wager, I must not reveal his name and he must not
reveal mine."

"Whew!" exclaimed Cub, addressing his two friends, who removed the phones
from their ears, the better to hear him. "Can you beat that?"

"We sure have hit a sensation of some sort," Hal declared.
"What'll we do?"

"I don't know what under the sun to do," Cub replied. "I don't like to
pass him up, for fear he may be telling the truth; and yet, I don't like
to be the victim of a joke."